Improvement in loose pulleys



ZSheets--SheeiL J. P. GROSVENOR.

Improvement in Loose Pulleys.

Patented Apri|9,1872.

Jzve?? La i? J. P. G R-OSVENOR.`

Improvement in Loose Pulleys.

Patented Apri|.9, 1872.

UivrTEn STATES PATENT OFFICE.

JONATHAN i?. GEOSVENOE, OF LOWELL, MASSACHUSETTS.

IMPROVEMENT IN LOOSE PULLEVS.

Specification forming part of Letters Patent N o. 125,388, dated April 9, 1872.

otherlubricant, so that the oil will not escape.

from the pulley while stationary, and while revolving is kept within the pulley and constantly a-pplied to all parts of the bearing by the motion of the pulley.

Figure lis a sectional view of the pulley when adjusted for operation upon a vertical plane passing through the line of the shaft. Fig. 2 is a sectional view in the vsaine plane ot' the hub and disk ofthe pulley, upon which it revolves. Figs. 3 and l arc sectional views in the same plane of the parts of the pulley disconnected, to permit the hub4 and disk to be introduced into place. Fig. 5 is an end View Ot' the pulley with the hub and disk secured in place. Figs. 6, 7, 8,9, 10, 11, and l2 represent a modifica-tion ot' the same device suited to pulleys of small diameter.

A is a hub and disk. The latter is secured to the shaft by set-screws N, holdingit and the disk firmly in place. The outer rim of the disk is fitted accurately on its edge and sides to the inner surface of the pulley, and forms the bearing upon which the latter revolves'. This rim of the disk is made somewhat thicker than the disk further inward, and the bearing formed on it is grooved across the iace, to allow the oil to circulate. Through the rim of the disk passageways C (l are made, connecting the oil-chamber E with the bearing. At some distance inside its rim, annular projections e e are formed upon each side ofthe disk concentric with its periphery, overlapping the sides of the pulley, as shown, to assist in preventing the escape of oil from the pulley. B C is the pulley, cast in two parts, as shown, for the purpose of introducing the hub and disk within it. The side Gis fitted to the rim of the part B with an oil-tight joint around its edge; and, when the disk and hub are in place, is secured, by screws d d, to the part B. Any suitable packing-material may be used to render the joint around the edge of the part C tight. The interior face of the rim of the pulley is turned out to tit around the rim of the disk and revolve upon it; and further toward its center the sides of the pulley swell outward and then inward again, as shown, s0 that their central .annular edges curve around within the annular projections e e ofthe disk, and are themselves formed into annular channels i t' within the projections on each side ot' the disk. The channels t' t a-nd annular projections e c togetherserve to prevent any oil from being thrown or escaping outside the pulley, conveying any oil which falls from,above around to the lower side of the pulley. E is the oilchamber, its parts being connected by holes through the disk. r is a screw, removable, for the purpose ot' introducing oil into the chamber lil. To adjust the pulley for use the hub and disk A are placed within the pulley B O and secured as described. The hub is then slipped on a shaft,`and secured to it by the set-screws M N. The pulley is turned around until the screw 7' is in proper position, when the screw is taken out and the oil poured into the ol-chamber. The screwr is then replaced, and the belt run upon the pulley. The rotary motion of the latter will always keep the Oil around the interior rim of the pulley upon the bearing of the disk, thus properly lubricating it and preventing the escape of oil from its y chamber. Neither can any oil escape from the pulley while it is stationary or being stopped.

Figs. 6, 7, S, 9, l0, 1l, and 12 represent a modication of the pulley lshown in Figs. l to 6, to adapt its operation to pulleys of small diameter. ln this niodilication the oil-chamber E is placed entirely within the hub and disk A. The pulley B C hasboth sides removable instead oi' one, and the sides are flat surfaces upon their exterior. The hub is secured to the shaft by drawing up the circular wedges s s by the screws o o instead of by a set-screw;

and the screw 1", for introducing oil, is placed upon the face instead of the side of the pulley. The several parts perform the saine functions, and are lettered to correspond with those of the pulley iirst described.

I claim as new and my inventionl 1. The pulley B Gand hub and diskA conlbined, to prevent the escape of oil from the pulley, and to lubricat-e the latter automatically7 substantially as described.

2. The oil-chamber E, placed Within the periphery of the disk A7 upon which the bearing is formed, and' connected with the latter by suitable channels for the oil7 substantially as described.

3. The bearing of the pulley7 formed upon the rim of the disk A, which is of larger diameter than the apertures in the sides of the pulley through which the shaft passes, substantially as described.

4. The combination of the annular projections e e and the annular channels z' i, substantially as described.

JONATHAN P. GROSVENOR.

Witnesses D. HALL RICE, ERAsTUs STEARNs. 

